/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.q2;

import jline.ArgumentCompletor;
import jline.Completor;
import jline.ConsoleReader;

import java.io.*;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;

public class CLI implements Runnable {
	Thread t;
	Completor completor;
	String line = null;
	boolean keepRunning = false;
	protected CLIContext ctx;
	CLICommandInterface cmdInterface;

	public CLI(Q2 q2, String line, boolean keepRunning) throws IOException {
		this(q2, System.in, System.out, line, keepRunning);
	}

	public CLI(Q2 q2, InputStream in, OutputStream out, String line, boolean keepRunning) throws IOException {
		ConsoleReader reader = new ConsoleReader(in, new OutputStreamWriter(out));
		reader.setBellEnabled(true);

		ctx = new CLIContext();
		ctx.setQ2(q2);
		ctx.setConsoleReader(reader);
		ctx.setOutputStream(new PrintStream(out));

		this.line = line;
		this.keepRunning = keepRunning;

		initCompletor();
	}

	protected boolean isRunning() {
		return ctx.getQ2().running();
	}

	protected void markStopped() {
	}

	protected void markStarted() {
	}

	protected String[] getCompletionPrefixes() {
		return new String[]{"org.jpos.q2.cli."};
	}

	protected String getPrompt() {
		return "q2> ";
	}

	protected void handleExit() {
	}

	private void initCompletor() throws IOException {
		cmdInterface = new CLICommandInterface(ctx);
		for (String s : getCompletionPrefixes()) {
			cmdInterface.addPrefix(s);
		}

		List<Completor> l = new LinkedList<Completor>();
		l.add(new CLIPrefixedClassNameCompletor(cmdInterface.getPrefixes()));
		completor = new ArgumentCompletor(l);
	}

	public void start() throws Exception {
		markStarted();
		t = new Thread(this);
		t.setName("Q2-CLI");
		t.start();
	}

	public void stop() {
		markStopped();
		try {
			t.join();
		} catch (InterruptedException ignored) {
		}
	}

	public void run() {
		while (isRunning()) {
			if (line == null) {
				ConsoleReader reader = ctx.getConsoleReader();
				reader.addCompletor(completor);
				try {
					line = reader.readLine(getPrompt());
				} catch (IOException e) {
					ctx.printThrowable(e);
				} finally {
					reader.removeCompletor(completor);
				}
			}
			if (line != null) {
				StringTokenizer st = new StringTokenizer(line, ";");
				while (st.hasMoreTokens()) {
					String n = st.nextToken();
					try {
						cmdInterface.execCommand(n);
					} catch (IOException e) {
						ctx.printThrowable(e);
					}
				}
				line = null;
			}
			if (!keepRunning) {
				break;
			}
		}
		handleExit();
	}

	// COMPATIBILITY METHODS
	public void print(String s) {
	}

	public void println(String s) {
	}

	public boolean confirm(String prompt) throws IOException {
		return false;
	}

	public Q2 getQ2() {
		return null;
	}

	public ConsoleReader getConsoleReader() {
		return null;
	}

	public PrintStream getOutputStream() {
		return null;
	}

	public interface Command {
		void exec(CLI cli, String[] args) throws Exception;
	}
}
